Pencil sharpener



FIG. 1 is a perspective view of a pencil sharpener, showing my new design with the keyboard cover in a partially open position;

FIG. 2 is a front elevational view with the keyboard cover in a closed position;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plane view;

FIG. 5 is a left side elevational view; and

FIG. 6 is a right side elevational view. 

The ornamental design for a pencil sharpener, substantially as shown and described. 